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    AutoFilterCondition Enumeration
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     GridColumn Members
     GridColumn Constructor
    [Collapse]GridColumn Properties
      AbsoluteIndex Property
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      DisplayFormat Property
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      Image Property
      ImageAlignment Property
      ImageIndex Property
      ImageOptions Property
      Images Property
      IsLoading Property
      IsUnboundExpressionValid Property
      MaxWidth Property
      MinWidth Property
      MRUFilters Property
      Name Property
      OptionsColumn Property
      OptionsEditForm Property
      OptionsFilter Property
      ReadOnly Property
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      ShowButtonMode Property
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      SortIndex Property
      SortMode Property
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      Summary Property
      SummaryItem Property
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      Tag Property
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      UnboundExpression Property
      UnboundType Property
      View Property
      Visible Property
      VisibleIndex Property
      VisibleWidth Property
      Width Property
    [Expand]GridColumn Methods
   [Expand]GridColumnCollection Class
   [Expand]GridColumnReadOnlyCollection Class
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   [Expand]LayoutViewColumnCollection Class
   [Expand]OptionsColumn Class
   [Expand]OptionsColumnEditForm Class
   [Expand]OptionsColumnFilter Class
   [Expand]TileViewColumns Class
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 End-User Documentation

GridColumn.UnboundType Property

Gets or sets the data type and binding mode of the column.

Namespace:DevExpress.XtraGrid.Columns
Assembly:DevExpress.XtraGrid.v17.2.dll

Expanded Syntax

Property value

Type: UnboundColumnType
A DevExpress.Data.UnboundColumnType enumeration value representing the data type and binding mode of the column.
The default is UnboundColumnType.Bound.

Expanded Remarks

The Grid Control supports unbound columns. These are columns which aren't bound to any field in the grid's data source which is specified by the GridControl.DataSource and GridControl.DataMember properties. Data for unbound columns can be provided using one of two methods:

  • setting a formula (string expression) to the UnboundExpression property. In expressions, you can refer to other columns, and use various functions and operators. See Expressions, to learn about the syntax.
  • handling the ColumnView.CustomUnboundColumnData event. This event can also be used to save any changes made by an end-user in unbound columns via the grid.

To make a column unbound, set its UnboundType property to a DevExpress.Data.UnboundColumnType value that corresponds to the type of data the column will display. For example, if the column is supposed to display integer values, set the UnboundType property to DevExpress.Data.UnboundColumnType.Integer. The data type specified by the UnboundType property determines which editor should be used, by default, to edit the column's values. In addition, it also determines how values are aligned within the column and which sorting and validity rules should be applied to this column. See the DevExpress.Data.UnboundColumnType topic for information on the available data types for unbound columns.

If the column's UnboundType property is set to DevExpress.Data.UnboundColumnType.Bound it's assumed that this column is not unbound and it is bound to a specific field in the data source, specified by the FieldName property.
Note

The UnboundType property must be set after the column has been added to the ColumnView.Columns collection.

For unbound columns, you need to specify unique field names via the FieldName property.

See Unbound Columns to learn more.

Expanded Example

Assume that the Grid Control is bound to a table that contains the "Quantity", "UnitPrice" and "Discount" columns. The example below shows how to add an unbound column to the grid to display the amount of each order according to the expression: Quantity*UnitPrice*(1-Discount).

The result is displayed below:

For another example which illustrates working with unbound columns, see the Unbound Columns tutorial.

Expanded See Also

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